Didier-werke Ag

Didier Engineering Gmbh

Albert Kleinevoss

Claus Flockenhaus

Daniel Grimm

Hartmut Kainer

Klaus Merkel

Jochen Kopia

Karl-Heinrich Laue

Manfred Galow

Hans-Eugen Buhler

Thomas Weichert

Wilfried Schnelle

Hans Kleudgen

Karl-Heinz Mossal

Bernd Stein

Norbert Gerharz

Selim Yesiltas

Eduard Kessler

Bernhard Vedder

The invention concerns a refractory material based on chromium corundum, a chromium corundum brick made of said material as well as the use thereof.

Refractory material based on chromium corundum, a chromium corundum brick and the use of said brick

Very thin plates of ceramic material with low binding strength are difficult to manufacture, since the stability of the moldings is very low, so that they can hardly be fed to a subsequent treatment stage after shaping. Therefore, after the ceramic material is molded into plate-shaped moldings, these moldings are pushed onto a flat carrier in the plane of their plate surface and are heated on it for a few minutes, so that iron sulfates form, which impart dimensional stability to the moldings.

Process for the manufacture of thin plates with low binding strength

This invention relates to a process for the manufacture of catalysts for the reduction of oxides of nitrogen from exhaust gases and in chemical air cleaning processes in which a catalytically active material containing iron ores, chromium ores and/or zeolite is placed in contact with a carrier means having a series of openings; e.g., wire mesh, expanded or perforated metal or any type of grid-like structure to form a catalytic member. The carrier means is etched with an acid etchant before forming the catalytic member or, instead, the catalytic member is etched with an acid etchant. The catalytic member is bonded by a thermal treatment; e.g., drying, tempering and/or fixing. This invention also relates to catalytic members or products produced by the process. This invention proposes the use of pressure bonding to obtain a catalytic member product which has significantly improved catalytic activity, greater mechanical strength and higher resistance to chipping.

Process for the manufacture of catalyst members for the reduction of

A process for the manufacture of catalysts for the reduction of nitrogen oxides in exhaust gases or for chemical air cleaning processes, in which catalyst moldings are produced from a mixture of solid primary materials which include iron oxide or mixtures of iron oxide and chromium oxide and/or manganese oxide, which are reduced to grain sizes less than 2 mm, with the use of inorganic binders and sulfuric acid, and with the possible addition of activating additives, wherein:

Process for the manufacture of catalytic elements and catalytic elements

A composite refractory member includes at least one insert formed of an oxide ceramic material having a high resistance to molten material. The insert defines a discharge opening or other molten material contacting surface. A base structure encloses and supports the insert and is formed by molding a chemically setting refractory concrete including a refractory granulate of low-iron sintered magnesia with a MgO content of over 80 weight percent. Mold cores extend into the refractory concrete during molding such that the molded structure has expansion joints which later are filled with mortar.

Composite refractory member

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Hohr-Grenzhausen, Germany

Albert Kleinevoss